EX-99. CERT
CERTIFICATION PURSUANT TO SECTION 302
OF THE SARBANES-OXLEY ACT OF 2002
- --------------------------------------------------------------------------------
I, Terry K. Glenn, President of Merrill Lynch Funds for Institutions Series and
Master Institutional Money Market Trust, certify that:
1. I have reviewed this report on Form N-CSR of Merrill Lynch Funds for
Institutions Series and Master Institutional Money Market Trust
(together, the "Fund");
2. Based on my knowledge, this report does not contain any untrue
statement of a material fact or omit to state a material fact
necessary to make the statements made, in light of the circumstances
under which such statements were made, not misleading with respect to
the period covered by this report;
3. Based on my knowledge, the financial statements, and other financial
information included in this report, fairly present in all material
respects the financial condition, results of operations, changes in
net assets, and cash flows (if the financial statements are required
to include a statement of cash flows) of the Fund as of, and for, the
periods presented in this report;
4. The Fund's other certifying officer(s) and I are responsible for
establishing and maintaining disclosure controls and procedures (as
defined in Rule 30a-3(c) under the Investment Company Act of 1940) and
internal control over financial reporting (as defined in Rule 30a-3(d)
under the Investment Company Act of 1940) for the Fund and have:
a) designed such disclosure controls and procedures, or caused such
disclosure controls and procedures to be designed under our
supervision, to ensure that material information relating to the
Fund, including its consolidated subsidiaries, is made known to
us by others within those entities, particularly during the
period in which this report is being prepared;
b) evaluated the effectiveness of the Fund's disclosure controls and
procedures and presented in this report our conclusions about the
effectiveness of the disclosure controls and procedures, as of a
date
within 90 days prior to the filing date of this report based on
such evaluation; and
c) disclosed in this report any change in the Fund's internal
control over financial reporting that occurred during the Fund's
most recent fiscal half-year (the Fund's second fiscal half-year
in the case of an annual report) that has materially affected, or
is reasonably likely to materially affect, the Fund's internal
control over financial reporting; and
5. The Fund's other certifying officer(s) and I have disclosed to the
Fund's auditors and the audit committee of the Fund's board of
directors (or persons performing the equivalent functions):
a) all significant deficiencies and material weaknesses in the
design or operation of internal control over financial reporting
which are reasonably likely to adversely affect the Fund's
ability to record, process, summarize, and report financial
information; and
b) any fraud, whether or not material, that involves management or
other employees who have a significant role in the Fund's
internal control over financial reporting.
Date: December 20, 2004
____________________________________
Terry K. Glenn,
President of Merrill Lynch Funds for
Institutions Series and Master
Institutional Money Market Trust
EX-99. CERT
CERTIFICATION PURSUANT TO SECTION 302
OF THE SARBANES-OXLEY ACT OF 2002
- --------------------------------------------------------------------------------
I, William M. Breen, Chief Financial Officer of Merrill Lynch Funds for
Institutions Series and Master Institutional Money Market Trust, certify that:
1. I have reviewed this report on Form N-CSR of Merrill Lynch Funds for
Institutions Series and Master Institutional Money Market Trust
(together, the "Fund");
2. Based on my knowledge, this report does not contain any untrue
statement of a material fact or omit to state a material fact
necessary to make the statements made, in light of the circumstances
under which such statements were made, not misleading with respect to
the period covered by this report;
3. Based on my knowledge, the financial statements, and other financial
information included in this report, fairly present in all material
respects the financial condition, results of operations, changes in
net assets, and cash flows (if the financial statements are required
to include a statement of cash flows) of the Fund as of, and for, the
periods presented in this report;
4. The Fund's other certifying officer(s) and I are responsible for
establishing and maintaining disclosure controls and procedures (as
defined in Rule 30a-3(c) under the Investment Company Act of 1940) and
internal control over financial reporting (as defined in Rule 30a-3(d)
under the Investment Company Act of 1940) for the Fund and have:
a) designed such disclosure controls and procedures, or caused such
disclosure controls and procedures to be designed under our
supervision, to ensure that material information relating to the
Fund, including its consolidated subsidiaries, is made known to
us by others within those entities, particularly during the
period in which this report is being prepared;
b) evaluated the effectiveness of the Fund's disclosure controls and
procedures and presented in this report our conclusions about the
effectiveness of the disclosure controls and procedures, as of a
date within 90 days prior to the filing date of this report based
on such evaluation; and
c) disclosed in this report any change in the Fund's internal
control over financial reporting that occurred during the Fund's
most recent fiscal half-year (the Fund's second fiscal half-year
in the case of an annual report) that has materially affected, or
is reasonably likely to materially affect, the Fund's internal
control over financial reporting; and
5. The Fund's other certifying officer(s) and I have disclosed to the
Fund's auditors and the audit committee of the Fund's board of
directors (or persons performing the equivalent functions):
a) all significant deficiencies and material weaknesses in the
design or operation of internal control over financial reporting
which are reasonably likely to adversely affect the Fund's
ability to record, process, summarize, and report financial
information; and
b) any fraud, whether or not material, that involves management or
other employees who have a significant role in the Fund's
internal control over financial reporting.
Date: December 20, 2004
___________________________________
William M. Breen,
Chief Financial Officer of
Merrill Lynch Funds for Institutions
Series and Master Institutional Money
Market Trust